I thought 3 gears would be good for the street the diffs been in the car since i got it it's mini spooled don't tell the men in blue,I'll run it for now and hope for the best-run it with a 440hp 355 chev-got sick of a couple of jap cars beating me at the drags so i thought i'd build a new motor.my class is street legal cars i was running high 11's